Einführung in die biologisch-mikroskopische Belebtschlammanalyse. Von Petra Lorenz,Peter Lorenz Biologische Arbeitsbücher,Band 53. Quelle & Meyer Verlag,Wiesbaden, 1995, ISBN 3-494-01241-5, 176 S., kartoniert,DM 24, 80     

G. Haider 《洁净——土壤、空气、水》1997,25(2):105-105

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Production and Emissions of Atomic Carbon and Oxygen in the Inner Coma of Comet Halley: Role of Electron Impact     

A. Bhardwaj  S.A. Haider  R.P. Singhal 《Icarus》1996,120(2):412-430

A coupled chemistry–transport model is developed to study the production and loss of neutral atomic carbon and oxygen in the inner coma (≤10⁴km) of Comet Halley. Subsequently, the generation of OI 1304 Å and OI 1356 Å and CI 1561 Å and CI 1657 Å emissions is studied. Calculations are performed utilizing solar EUV, utilizing photoelectrons, and assuming the precipitation of high energy “auroral” electrons of solar wind origin, the evidence for which has been inferred from many observations, as the sources for the production of these atoms and emissions, including only the gas phase species in the cometary coma. It is revealed that the electron impact dissociation of parent species could be a potentially important source of C and O production and their emissions in the inner cometary coma. Our calculated O density profile is in agreement with that calculated by R. R. Hodges, Jr. (1990,Icarus83, 410–433). The present study has demonstrated the importance of contributions from sources other than the solar fluorescence for deriving the O and C production rates from their emission line brightness. It is found that the electron impact and solar fluorescence contribute 34 and 66%, respectively, to the OI 1304 Å emission. However, when the auroral electrons are also included, the relative contributions of electron impact and solar fluorescence are 72 and 28%, respectively. In the case of CI 1657 Å the electron impact contribution amounts to 24 (18)% with (without) inclusion of auroral electrons.  相似文献   

Statistical analysis of different chemical elements in groundwater of northwestern Saudi Arabia     

Taisser Zumlot  Awni Batayneh  Haider Zaman  Habes Ghrefat  Saad Mogren  Yousef Nazzal  Eslam Elawadi  Mahmoud Elwaheidi 《Journal of the Geological Society of India》2016,87(4):469-475

A total of 72 water samples were collected from the sub-surface aquifer system in the Midyan basin and analyzed for 24 major, minor and trace elements. Histograms and normal quantile plots were used to delineate the sub-populations of the chemical constituents in the studied groundwater samples. Some of the elements such as Al, K, Ca, Mg, Na and Cl have concentrations that could be linked to the weathering of the surface rock strata. On the other hand, the elements like As, Pb and Sb have concentration, that can be linked to agricultural practices in the area. The use of simple statistical analysis, frequency histograms, and Q-Q plots were useful for the detection and evaluation of elemental constituents in the groundwater of the study area.  相似文献   

Evaluation of various relationships of reaeration rate coefficient for modeling dissolved oxygen in a river with extreme flow variations in Pakistan     

Husnain Haider  Waris Ali  Sajjad Haydar 《水文研究》2013,27(26):3949-3963

Mathematical relationships have been developed for reaeration rate coefficient (K_a) by various researchers. These relationships have a number of variables such as depth, velocity, width, slope, Froud number, molecular diffusion coefficient, kinematic viscosity and the gas‐transfer Reynolds number. From these variables, 29 relations have been developed and divided into four groups. To evaluate their predictive capability for highly variable flow rivers receiving high pollution loads form large cities, these relationships have been used to model dissolved oxygen (DO) in the River Ravi. Such rivers are either saturated with DO during high flows or anaerobic during critical low‐flow conditions. The evaluation is based on the agreement between model DO values calculated using K_a obtained from the available equations and the measured DO concentrations in the river samples in terms of sum of square of residuals (SSR) and coefficient of determination (R²). It has been found that in general, the group of equations containing depth and velocity as the only two variables affecting K_a performed better than the equations in other groups as reflected by lower SSR and higher R² values. The study results also reveal that the turbulence‐based reaeration rate coefficient equation containing additional variables also resulted in close agreement between DO model results and the measured values. The study results identify the most important parameters affecting the reaeration rate coefficient and the suitability of various K_a relationships as well for rivers with highly variable flows. Copyright © 2012 John Wiley & Sons, Ltd.  相似文献   

Effect of Parthenium Extract on the Metabolism of Young Colisa Fasciatus (BL. and SCHN.) (Pisces,Perciformes)     

M. S. Prasad  Z. A. Haider 《洁净——土壤、空气、水》1986,14(6):661-666

Parthenium hysterophorus seed extract possesses the potentiality to alter the fish metabolism. Lower concentrations (sublethal) of the seed extract stimulate the respiratory muscles, resulting in an increased rate of O₂ uptake, whereas higher concentrations (lethal) exhibit a neuro-toxic effect causing paralysis of the respiratory muscles manifested by a decreased rate of O₂ uptake, cessation of the respiratory pumps and casualty by asphyxiation. The seed extract also inhibits the activity of the enzymes SDH and carbonic anhydrase at the gas exchange sites. The log/log plotting of the O₂ uptake (mg/h) and the exposure period (2, 6, 12, 24, 72 and 168 h) showed slope values of 0.0744, 0.0778, 0.0322 and 0.0164, respectively, in four concentrations (10, 20, 25 and 30 %) of Parthenium extract.  相似文献   

New age constraints on counter-clockwise rotation of NE Japan     

Ayumi K. Baba  Takaaki Matsuda  Tetsumaru Itaya  Yutaka Wada  Noriyuki Hori  Masahiko Yokoyama  Nobuaki Eto  Rieko Kamei  Haider Zaman  Tesfaye Kidane  Yo-Ichiro Otofuji 《Geophysical Journal International》2007,171(3):1325-1341

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Investigation of the weathering layer using seismic refraction and high-resolution seismic reflection methods, NE of Riyadh city     

Ghunaim T. Al-Anezi  Abdullah M. Al-Amri  Haider Zaman 《Arabian Journal of Geosciences》2012,5(6):1347-1358

Five seismic refraction and five high-resolution seismic reflection (HRSR) profiles were carried out in northeastern part of Riyadh city to investigate depth of the weathering layer. Results obtained from seismic refraction survey reveal the depths of weathering layer at 12, 25, 17, 12, and 16?m, respectively. On the other hand, HRSR stack sections illustrate the depths of weathering layer at 14, 28, 20, 13, and 18?m, respectively. The weathering layer is composed of alluvial sediments and gravel, which is underlain by a sequence of limestone and dolomite layer. Seismic results from site no. 2 have been found to be in good agreement with lithological information reported from the adjacent water well. The HRSR data generally reveal better signal-to-noise ratio and enhanced resolution compared to the refraction data. Although, the HRSR data failed in achieving high-quality common midpoint (CMP) stacking profile at site no. 3, it provide an improved image of the subsurface features than the refraction data, recognizing it as a potential seismic technique.  相似文献   

Heavy metal toxicity levels in the coastal sediments of the Arabian Sea along the urban Karachi (Pakistan) region   总被引：1，自引：0，他引：1  

Azhar Siddique  Majid Mumtaz  Nayyer A. Zaigham  Khalil A. Mallick  Sumayya Saied  Erum Zahir  Haider A. Khwaja 《Marine pollution bulletin》2009,58(9):1406-1414

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Structural Seismology: Exploring the Correspondence between Surface Geological Features and Heterogeneities in the Earth’s Crust and Mantle     

GAO StephenShangxing  LIU KellyHong  FU Xiaofei  Haider DAHM  KONG Fansheng  LIU Lin  Cory REED  SUN Muchen  YU Youqiang 《《地质学报》英文版》2019,93(Z2):3-4

The North Qaidam is an Early Paleozoic UHP metamorphic belt located at the north margin of the Tibet plateau. Eclogites in this belt contain both continental‐and oceanic‐type ones. In which, the continental‐type eclogites have protolith ages of 750–850 Ma and WPB or CFB geochemical signatures and are believed to have formed in a continental rift or an incipient oceanic basin setting related to the breakup of the Rodinia supercontinent, their metamorphic ages (421–458 Ma) and P–T paths are comparable to their host gneisses; oceanic‐type eclogites have cumulate gabbro or E‐MORB geochemical signatures, their protolith and metamorphic ages are 510–516 Ma and 425–450 Ma, respectively(Zhang et al., 2008). Therefore, the North Qaidam UHP belt was thought to record the whole Neoprotoerozoic–Paleozoic Wilson cycle (Song et al., 2014). In this study, we reported three new kinds of eclogites: kyanite‐bearing eclogite, lawsonite pseudomorph‐bearing eclogite and double mineral eclogite. They occur as big lentoid blocks in regional granitic gneiss in the western part of the belt. Phase equilibrium modelling and zircon LA‐ICPMS U‐Pb dating show that all these three eclogites experienced a clockwise P–T path with peak metamorphic conditions close to or fall in the coesite stability field, and their peak metamorphic age were around 436‐439 Ma, similar to those continental‐type eclogites in this belt. But their protolith ages are between 1273 and 1070 Ma, and some of them recorded an amphibolite facies metamorphic age of 927 Ma, and geochemical data and zircon Lu‐Hf and O isotope analysis indicate these eclogites have features of present day N‐MORB. Combined with the existing results, we propose that the North Qaidam is a polycyclic composite orogenwhich recorded tectonic evolution of Mesoproterozoic ocean floor spreading, assembly and breakup of Rodinia supercontinent, Early Paleozoic oceanic deep subduction and subsequently continental deep subduction.  相似文献   

Identification of the Major Allergen in Greasy-Back Shrimp （Metapenaeus ensis） by MALDI-TOF-MS     

Samee Haider 《中国海洋大学学报(英文版)》2010,9(2):178-184

In order to better understand shrimp allergen,some basic characters of the major allergen of greasy-back shrimp (Metapenaeus ensis)were investigated.The major allergen was extracted and separated,and its peptide mass fingerprint(PMF) was analyzed using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry(MALDI-TOF-MS).After screening in the NCBI database with Mascot searching engine,the results indicated that the major allergen of greasy-back shirmp was muscle tropomyosin.Database matching search showed that the top protein matched,i.e.the tropomyosin from giant tiger prawn(Penaeus monodon),had a Mowse value of 268.In addition,there were 27 queries matched with the allergen in greasy-back shirmp with an amino acid sequence coverage value of 65%.The matching scores and the sequence coverage values were also high with tropomyosins of other invertebrates,including Tyrophagus putrescentiae and Lepisma saccharina.These results indicated that the allergen of Metapenaeus ensis had high homology with other crustacean allergens,and provided molecular explanations for the high cross-reactivity of the major allergens between crustaceans and some other invertebrates.  相似文献